Earnings per Share (Computation of Basic and Diluted Earnings per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Numerator:
Net income (loss)	$ 18,568		$ 9,305		$ 6,818		$ 7,385		$ 11,853	$ 12,138	$ 7,411	$ (1,745)	$ 42,076		$ 29,657		$ (2,715)
Denominator:
Basic													11,948		11,850		11,735
Dilutive effect of stock options, restricted stock and restricted stock units (1)													46	[1]	75	[1]
Weighted average diluted shares with assumed conversions													11,994		11,925		11,735
Net earnings (loss) per share:
Basic	$ 1.55	[2]	$ 0.78	[2]	$ 0.57	[2]	$ 0.62	[2]	$ 0.99	$ 1.03	$ 0.63	$ (0.15)	$ 3.52	[2]	$ 2.50		$ (0.23)
Diluted	$ 1.54	[2]	$ 0.77	[2]	$ 0.57	[2]	$ 0.62	[2]	$ 0.99	$ 1.02	$ 0.63	$ (0.15)	$ 3.51	[2]	$ 2.49		$ (0.23)

[1] In Fiscal 2011, approximately 23,000 shares related to outstanding stock options and restricted stock units were excluded from the computation of diluted earnings (loss) per share because they were antidilutive.

[2] The increase in earnings per share for the fourth quarter of Fiscal 2013 was primarily driven by the release of our Canadian valuation allowance. For an explanation of the effective tax rate in Fiscal 2013, see Note H.